Nickel Alloy Pipe Specification – ASTM B474

Overview

This specification governs electric fusion welded pipe used in high-temperature or corrosive environments. There are five distinct classes covered under ASTM B474: Class 1, Class 2, Class 3, Class 4 and Class 5. Each Class outlines the type of welding and xray that is required. The purchaser should select the class when quoting or ordering to this specification. Full penetration welding is required as is heat treatment. Mechanical testing is also required.

Class 1—Pipe to be double welded with filler metal; the entire weld will be x-ray.

Class 2—Pipe to be double welded with filler metal; no x-ray is required.

Class 3—Pipe to be single welded with filler metal; the entire weld will be x-ray.

Class 4—Same as Class 3 but the weld pass exposed to the inside of the pipe surface does not require the addition of filler metal.

Class 5—Pipe to be double welded with filler metal; the weld area on the pipe will undergo spot x-ray.

Recommended Heat Treatment:

Alloy

UNS Designation

PWHTA,B
Deg. F. (Deg. C)

Quench

200 (Ni)

N02200

1650-1700 (900 to 928)

Rapid Air/water

201 (Low C)

N02201

1650-1700 (900 to 928)

Rapid Air/water

400 (Ni-Cu)

N04400

1650-1700 (900 to 928)

Rapid Air/water

X (Ni-Cr-Mo-Fe)

N06002

2150 (1177)C

Rapid Air/water

C22D (Low C-Ni-Mo-Cr)

N06022

2050-(1120)C

Rapid Air/water

G30D (Ni-Cr-Fe-Mo-Cu)

N06030

2150 (1177)C

Rapid Air/water

C2000D(Ni-Cr-Mo-Cu)

N06200

2075-2125 (1135-1163)B

Rapid Air/water

230D (Ni-Cr-W-Mo)

N06230

2150-2250 (1177-1232)B

Rapid Air/water

600 (Ni-Cr-Fe)

N06600

1800-1850 (983 to 1010)

Rapid Air/water

601 (Ni-Cr-Fe-Al)

N06601

1600-1650 (874 to 900)E

Rapid Air/water

625 (Ni-Cr-Mo-Cb) Grade 1

N06625

1600 (871)C

Rapid Air/water

625 (Ni-Cr-Mo-Cb) Grade 2

N06625

2000 (1093)C

Rapid Air/water

G3D (Ni-Cr-Fe-Mo-Cu)

N06985

2100-2150 (1147 to 1177)B

Rapid Air/water

Alloy 20 (Cr-Ni-Fe-Mo-Cu-Cb)

N08020

1700-1850 (927 to 1010)

Rapid Air/water

…

N08024

1925-1975 (1052 to 1079)

Rapid Air/water

…

N08026

2050-2200 (1121 to 1204)

Rapid Air/water

825 (Ni-Fe-Cr-Mo-Cu)

N08825

1700-1800 (930 to 980)E

Rapid Air/water

C276 (Low C-Ni-Mo-Cr)

N10276

2050 (1121)C

Rapid Air/water

B2 (Ni-Mo)

N10665

1950 (1065)C

Rapid Air/water

B3D (Ni-Mo)

N10675

1950 (1065)C

Rapid Air/water

A Recommended temperatures—Different temperatures may be selected by either the purchaser or the manufacturer.

B Set temperatures, ±25°F (±14°C).

C Minimum set temperature.

D Registered Trademark of Haynes International.

E Heat treatment is highly dependent on intended service temperature — consult material manufacturer for specific heat treatments for end use temperature.

Note this data is for overview only. For full specification and current revisions, please contact ASTM.